Ventilating hose



Dec. 20, 1.938; A.rD-. MAcLcHLAN 2,140,638

VENTILATING HosE Filed April 2.l 1937 l. Patented 21'), y l l UNlTl-:D `STATES PATENT oFF-loa to The B. F. Goodrich Company, New York, N. Y., a corporation of New York Application april z, 1931, serial No. 134,539

` s claims. (cl. 13a-5s) This `invention relates to ventilating hose and with the rubber in an unvulcanized condition and especially to hose for conducting air into and out then the whole may be subjected to a vulcanizlng of chambers such as the cabins of aircraft where operation'to produce a homogeneous structure. it is desired to conduct the air Without. objec Apparently the success of this hose constructionably transmitting noise such as propeller andtion vlin conducting air without objectionable 5 motor noise, from the exterior to the interior of transmission of sound results primarily from the the chamber. sound deadeningl construction of the hose wall,

The chief objects of the invention are to prothe areas of the wall between convolutions of the vide for conducting the air without objectionable strip reinforcement' being yieldable so as to transmission of sound and to provide hose for cushion the impacts of sound waves and thereby 1o such purpose of a light and flexible construction to reduce or eliminate the reflection of sound that is suitable for conducting the air' under pres-l waves striking the wall, and to prevent reverberasure without objectionable leakage. tion of the sound within the tube. Also the in- 'I'hese and further objects will be apparent terior surface ofl the hose, which is of felt, is in 16 from the following description, `reference being itself. an inhibitor of sound reflection, and the 15 had tothe accompanying drawing in which; hose construction is such that its wall strongly F18. 1 is an elevation with broken, away resists transmission of sound waves longitudinally and sectioned ofxa Ventilating hose constructed through the Wallaccording to and embodying tne'lnvention. l In the embodiment of Fis. 3. the materials upon 20 Fig. 2 is a section taken along the line 2-2 of the feltltube of the hose wall are in layers ds- 20 Fig. 1. continuous in the direct axial direction for the Fig. 3 is a view like Flg. 1 but showing a modi- DUrDOSe 0f further reducing the likelihOOd 0f s fled construction. sound transmission through the materials of the Fig. 4 is a view like Fig. 1 but showing a furhose body. Upon the felt lining I4 is disposed a therl modified constructien, band I5 of rubber, which, as distinguished from 25 Y Referring to the embodiment of Figs. 1 and 2, the continuous form of the rubber layer II in lthe Ventilating hose comprises a lining tube' l0 l Fig. 1, is disposed in spaced apart helical convoluof a suitable flexible sound-deadening material, tions in the embodiment of Fig. 3. A coating of preferably felt. In order to prevent leakage of cement may be employed uponthe lining I4 in 80 air under pressure the felt lining preferably has order to facilitate adhesion with the band I5. 30

an outer layer or coating ll of rubber which may Between the convolutions of the band I5 is disbe soft. flexible, and quite thin so as not to inposed a Strip reinforcement I6. preferably wire, crease objectionably the exibility or weight of lll helical COHVUIutODS- Preferably the 'Spelling the hose. For good adhesion a rubber cement is such that the strip reinforcement I6 does not $5 may be applied between the felt tube In and the contact the band I5 of rubber. In order that the 35 'rubber layer Il. Upon the layer ll is disposedb, strip reinforcement I6 does not .shift objectionstrip I2 of reinforcing'material, preferably wire t ably from its assembled Position Onel more applied in helical convolutions that-are considsuperimposed tapes I1. I8. preferably of rubbererably spaced apart` so as to provide extensive ized bias-laid, square-Woven fabric, are applied 4'0 reaches of. the yieldeble hose weil between the' upon the strip reinforcement I6 with their mar- 40 convolutions eifective to. ycushion non-resiliently zins adhered to the band I5 of rubber and with the impact of sound waves against the wan and the margins of adjacent convolutions of the tapes effect a deadening of the sound. For the pur- 'spaced aprt- Thus the Only dlrectvaxial 0011- pose of retaining the reinforcing strip l2 in nuity of thehose materials resides inthe lining 46 place without objectionable shiftingv a tape v I3, I4. Which, however. is of felt and iS in itself a 45 preferably of rubberized, bias-laid, square-woven D001 SOI-'Ind COnduCtOL '.fabric, is mounted upon thestrip reinforcement v111 the embdlmenl 0f Fig- 4 a SOmeWhat and has its margins adhered t0 the layer II, the stronger construction is provided. withouthowarrangement preferably being such that the con. lever rendering the hose wall objectionably trans- -50 volutions of the tape I3 are spaced apart, Thismissive to sound, Waves. This embodiment is 50 makes for exibility and light weight of the struclike the construction of Fig. 3 except that'an adture and lessens the likelihood of transmission oi.'v dltional layer I9 is incorporated between the felt sound waves through the materials of the hose lining and outer materials. This layer preferably body. is 'of a liglit', openmesh fabric, such as stockinet,

The 4parte above described im.` be' assembled which, while it reinforces the hole deslrably. 5|

. from the scope of the invention as it is hereinafter claimed.

I claim: y l

1. Ventilating hose comprising a yieldable wall having an inner layer of sound-deadening felt, a layer of stockinet upon the felt, a band of rubber- .like material and metallic strip material in spaced-apart helical convolutions outwardly thereof, and a tape of rubberized fabric upon the metallic strip material in spaced-apart helical convolutions.

2. Ventilating hose comprising a light weight body having an inner layer of sound-deadening felt, a continuous metallic strip disposed in heli- 4cal convolutions to prevent collapse of the body,

a continuous layer of stockinet or the like stretchable fabric in the body, and rubber-like material disposed between the convolutions of the metallic strip for holding the elements of the body together while permitting a high degree of exibility of the hose.

3. Ventilating hose comprising a light weight bodyv having an Ainner layer of sound-deadening felt, a continuous metallic strip disposed in helical convolutions to prevent collapse of the body, a continuous layer of stockinet or like stretchable fabric in the body, a tape disposed in spacedapart helical convolutions and following the course of metallic strip material upon the same, and rubber-like material disposed between the convolutions of the metallic strip for holding the elementsof the body together While permitting a high degree of flexibility of the hose.

ANDREW D. MACLACHLAN. 

